Picked up a Sears-Penske 21015 dwell/tach meter today and installed a new 4.5v battery.I have no manual unfortunately. I'm trying to figure out how to calibrate the 'set line' setting but can't get the meter to move.I verified the meter is working. I assume this is for the points resistance measurements. Does anyone happen to have this model by chance?

I was able to get it working last night. Itís been a while since I had to take out the DVM and troubleshoot a point to point wiring circuit (did that in the 70ís when I repaired TVís back then) and it turned out to be a cold solder joint. A little sweating of the joint and prestoÖit worked. I can now get the zero set to function. Nothing like seeing 'Made in the USA' label on something this old and still working.